It's been a while since I've done one of those engines and going on vague memory, but I don't think you have to remove the injectors, but something tells me to remove the valve cover you have to remove those cloth braided fuel return hoses that jump between injectors. If so, when you order your head gasket you might consider ordering 1 or 2 ft of that hose, it's a special metric size you won't find at an auto parts and it does deteriorate.